/usr/lib/s9fes/help/sqrt is in scheme9 2010.11.13-2.
This file is owned by root:root, with mode 0o644.
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1 2 3 4 5 | R4RS 6.5.5 (sqrt number) ==> number
Returns the principal square root of NUMBER.
(sqrt 2) ==> 1.41421356237309504
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